A trench shoring device for municipal pipes

Abstract

This utility model discloses a trench support device for municipal pipelines, relating to the field of municipal construction technology, including a baffle assembly, a cross brace assembly, and a protective cover. The cross brace assembly includes a sleeve and a telescopic rod. The protective cover includes an N-shaped plate and a snap-fit ​​vertical plate; the N-shaped plate can be adapted to snap onto the outer periphery of the sleeve, and the snap-fit ​​vertical plate can be adapted to snap onto the outer surface of the telescopic rod. The protective cover also includes a first rotating base plate and a second rotating base plate; the protective cover also includes a counterweight strip and a magnetic strip; one end of the first rotating base plate is rotatably connected to the bottom end of the first vertical plate, and the other end is fixedly connected to the magnetic strip; one end of the second rotating base plate is rotatably connected to the bottom end of the second vertical plate, and the other end is fixedly connected to the counterweight strip; the magnetic strip and the counterweight strip can attract each other to fit together to seal the bottom of the inner cavity of the protective cover. In this utility model, by fastening the protective cover to the outer periphery of the cross brace assembly, splashed sticky impurities will adhere to the protective cover rather than the telescopic rod, thus enabling the telescopic rod to extend and retract smoothly.

Description

Technical Field

[0001] This utility model relates to the field of municipal construction technology, specifically to a trench support device for municipal pipelines. Background Technology

[0002] Municipal pipelines typically include water supply networks, stormwater networks, and sewage networks; the main function of stormwater networks is to collect and discharge rainwater to prevent waterlogging and flooding in cities and ensure the normal operation of urban drainage systems.

[0003] Rainwater pipes are usually buried underground, so trenches need to be excavated during construction to bury the pipes in the trenches; the inner walls of the trenches need to be equipped with support structures to prevent collapse.

[0004] Box-type support is a new type of support structure that uses a telescopic rod structure to adjust the distance between the two retaining plates on the left and right sides, thereby achieving support for the inner wall of the trench. The telescopic rod structure consists of a sleeve and a telescopic rod, with a gap between the sleeve and the telescopic rod. In actual construction, highly viscous impurities may adhere to the surface of the telescopic rod (such as droplets generated during the transportation of concrete mortar, or structural fog generated during painting operations). When the telescopic rod retracts, the viscous impurities will get stuck in the gap between the sleeve and the telescopic rod (the gap is usually equipped with a sealing ring, but the sealing ring can only block impurities with poor adhesion, such as dust particles, while highly viscous impurities have a large connection force with the telescopic rod and are difficult to dislodge even when pushed by the sealing ring). Summary of the Invention

[0005] In order to overcome the problem of "highly viscous impurities adhering to the telescopic rod, causing the sleeve and telescopic rod to be jammed" in the above-mentioned background technology, this utility model provides a trench support device for municipal pipelines.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is:

[0007] A trench support device for municipal pipelines includes a baffle assembly abutting against the inner wall of the trench, a cross brace assembly for laterally supporting the baffle assembly, and a protective cover that can be fastened to the outer periphery of the cross brace assembly.

[0008] The cross brace assembly includes a sleeve and a telescopic rod. The end of the telescopic rod is inserted into the insertion cavity of the sleeve, and the telescopic rod can extend and retract laterally. The protective cover includes an N-shaped plate and a snap-fit ​​upright plate. The N-shaped plate can be adapted to snap onto the outer periphery of the sleeve, and the snap-fit ​​upright plate can be adapted to snap onto the outer surface of the telescopic rod. The N-shaped plate includes an arc plate portion, a first upright plate portion, and a second upright plate portion. The bottom ends of the arc plate portion are respectively fixedly connected to the top ends of the first upright plate portion and the top ends of the second upright plate portion. The snap-fit ​​upright plate is fixedly installed on the protective cover. The inner cavity of the cover is located near the end of the arc plate portion; the protective cover also includes a first rotating base plate and a second rotating base plate; the protective cover also includes a counterweight strip and a magnetic strip for driving the protective cover to maintain a vertical position; one end of the first rotating base plate is rotatably connected to the bottom end of the first upright plate portion, and the other end is fixedly connected to the magnetic strip; one end of the second rotating base plate is rotatably connected to the bottom end of the second upright plate portion, and the other end is fixedly connected to the counterweight strip; the magnetic strip and the counterweight strip can attract each other to fit together to seal the bottom of the inner cavity of the protective cover.

[0009] As a further optimization of this utility model, the snap-fit ​​plate is n-shaped and has a slot in the middle. The slot can be adapted to snap onto the outer wall of the telescopic rod, and the slot is coaxially arranged with the arc plate.

[0010] As a further optimization of this utility model, the arc plate portion is tangentially arranged to the first upright plate portion; the arc plate portion is tangentially arranged to the second upright plate portion; and the first upright plate portion and the second upright plate portion are arranged parallel to each other.

[0011] As a further optimization of this utility model, the opening direction of the inner cavity of the n-shaped plate is set in the same direction as the opening direction of the slot.

[0012] As a further optimization of this utility model, the first rotating base plate is fixedly connected to the magnetic strip in an L-shape; the second rotating base plate is fixedly connected to the counterweight strip in an L-shape.

[0013] As a further optimization of this utility model, the snap-fit ​​plate can rotate around the telescopic rod; the inner surface of the n-shaped plate and the outer surface of the sleeve support are provided with a first movable gap; and the inner edge of the snap-fit ​​plate and the outer surface of the telescopic rod are provided with a second movable gap.

[0014] As a further optimization of this utility model, two snap-fit ​​uprights are provided, and the distance between the two snap-fit ​​uprights is adapted to the length of the sleeve.

[0015] As a further optimization of this utility model, the length of the n-shaped plate is greater than the length of the sleeve.

[0016] As a further optimization of this utility model, the baffle assembly includes a side plate and a back support plate installed on the side wall of the side plate. There are several back support plates, all of which are vertically arranged, and there is an installation gap between adjacent back support plates. A pressure block is fixedly connected to the end of the telescopic rod away from the sleeve. The pressure block is inserted into the installation gap and fixedly connected to the side plate by locking bolts.

[0017] As a further optimization of this utility model, the side plate is provided with mounting holes, and the mounting holes are provided in a plurality of them and arranged vertically in a linear array; the pressure block can be selectively installed in different mounting hole positions by means of the locking bolt.

[0018] In summary, this utility model has at least one of the following advantages:

[0019] (1) In this utility model, a protective cover is fastened to the outer periphery of the cross brace assembly, so that the splashed sticky impurities will adhere to the protective cover rather than the telescopic rod, and the telescopic rod can achieve smooth extension and retraction without getting stuck with the sleeve.

[0020] (2) The magnetic strip and counterweight strip bear the weight and can drive the protective cover to achieve self-balance (the protective cover in the tilted state rotates to the vertical state). Then the arc plate can always be located directly above the cross brace and block the vertically dripping concrete mortar droplets. The first vertical plate and the second vertical plate can always be located on the left and right sides of the cross brace and block the diagonally downward splashing concrete mortar droplets, thereby preventing the concrete mortar droplets from contacting the telescopic rod and thus preventing the telescopic rod from being jammed.

[0021] (3) The magnetic strip and the counterweight strip can approach, attract and stick to each other, so the first rotating base plate and the second rotating base plate can be used to block the bottom opening of the inner cavity of the protective cover. Then the paint mist flowing from bottom to top is blocked by the first rotating base plate and the second rotating base plate, thereby preventing the paint mist from contacting the telescopic rod and thus preventing the telescopic rod from being stuck.

[0022] (4) After the user attaches the n-shaped plate to the outer periphery of the cross brace assembly, the first rotating base plate and the second rotating base plate can be rotated to achieve convenient adsorption of the magnetic strip and the counterweight strip. The operation is simple and convenient, and the protective cover can be installed quickly.

[0023] (5) The user removes the protective cover from bottom to top. During the process, the bottom surface of the sleeve hits the magnetic strip and the counterweight strip until they separate from each other. No additional dismantling action is required, which can make the protective cover easy and quick to remove. Attached Figure Description

[0024] The present application will be further explained below with reference to the accompanying drawings:

[0025] Figure 1This is a front view schematic diagram of the overall structure of this utility model;

[0026] Figure 2 A front view of the cross brace component structure in an elevation section;

[0027] Figure 3 A schematic diagram showing the state of the center insert rod being inserted into the center socket;

[0028] Figure 4 This is a schematic diagram showing the first and second snap-fit ​​housings in their snap-fit ​​state.

[0029] Figure 5 This is a schematic diagram of the sleeve and telescopic rod structure;

[0030] Figure 6 This is a front view of the vertical section of the protective cover structure;

[0031] Figure 7 This is a schematic diagram of the protective shield structure viewed from an angle.

[0032] Figure 8 This is a side view of the protective shield structure;

[0033] Figure 9 A side view of the magnetic strip and the counterweight strip in the state of mutual attraction;

[0034] Figure 10 A side view of the first and second rotating base plates in their open state;

[0035] Figure 11 A side view of the first rotating base plate and the magnetic strip connected in an L-shape.

[0036] Figure 12 This is a front view schematic diagram of the baffle assembly structure;

[0037] Figure 13 This is a top view of the baffle assembly structure.

[0038] Explanation of reference numerals in the attached figures:

[0039] In the picture,

[0040] 1. Baffle assembly; 11. Side plate; 120. Mounting clearance; 12. Back support plate; 121. Mounting hole; 122. Locking bolt;

[0041] 2. Cross brace assembly; 21. Sleeve; 2101. First snap-fit ​​housing; 2102. Second snap-fit ​​housing; 211. Center block; 212. Center insertion hole; 213. Insertion cavity; 214. Internal thread; 22. Telescopic rod; 221. Pressure block; 23. Stud; 231. External thread; 24. Sealing ring; 25. Center insertion rod;

[0042] 3. Protective cover; 31. N-shaped plate; 311. Arc plate section; 312. First upright plate section; 313. Second upright plate section; 32. Snap-on upright plate; 321. Slot; 33. First rotating base plate; 34. Second rotating base plate; 35. Magnetic strip; 36. Counterweight strip;

[0043] 4. Trench;

[0044] 5. Soil layer. Detailed Implementation

[0045] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows:

[0046] Reference Figures 1-3 This embodiment provides a trench support device for municipal pipelines, including a baffle assembly 1 abutting against the inner wall of the trench 4, a cross brace assembly 2 for laterally supporting the baffle assembly 1, and a protective cover 3 that can be fastened to the outer periphery of the cross brace assembly 2. The baffle assemblies 1 are arranged in pairs to support the soil layers 5 on both sides of the trench 4 respectively. The cross brace assembly 2 is disposed between the two baffle assemblies 1, and its two ends are connected to the baffle assemblies 1 on both sides respectively, thereby applying a supporting force to the left and right baffle assemblies 1.

[0047] Reference Figures 1-3 The cross brace assembly 2 includes a sleeve 21, a telescopic rod 22, a stud 23, a sealing ring 24, and a central insert rod 25. A central block 211 (e.g., fixedly connected by an integral component or by bolts) is provided in the center of the inner cavity of the sleeve 21. A central insertion hole 212 is provided along the axial direction of the sleeve 21. An insertion hole is provided at the end of the inner cavity of the sleeve 21. The stud 23 is located within the insertion hole and can reciprocate laterally along the axial direction of the insertion cavity 213. The stud 23 is coaxially arranged with and fixedly connected to the telescopic rod 22 (e.g., fixedly connected by an integral component). The end of the telescopic rod 22 is inserted into the insertion cavity 213.

[0048] Reference Figures 1-3 When the stud 23 reciprocates laterally along the axial direction of the insertion cavity 213, it drives the telescopic rod 22 to extend and retract laterally. When the telescopic rod 22 extends outward, it applies lateral pressure to the baffle assembly 1, thereby enabling the baffle assembly 1 to support the soil layer 5 on the side of the trench 4. When the telescopic rod 22 retracts inward, it separates the baffle assembly 1 from the soil layer 5 on the side of the trench 4, thus allowing the present invention to be easily removed from the trench 4.

[0049] Reference Figures 1-3The stud 23 and the sleeve 21 are connected by threads. When the stud 23 and the sleeve 21 rotate relative to each other, the stud 23 can move laterally along the axial direction of the insertion cavity 213. The central insertion hole 212 is a through hole structure. When the user inserts the central insertion rod 25 into the central insertion hole 212, and then pushes or pulls the end of the central insertion rod 25 away from the central insertion hole 212, the sleeve 21 can be driven to rotate. Since the stud 23 is fixedly connected to the telescopic rod 22, and the end of the telescopic rod 22 away from the sleeve 21 is connected to the baffle assembly 1, neither the telescopic rod 22 nor the stud 23 can rotate around its own axis. Therefore, the sleeve 21 can rotate relative to the stud 23, thereby pushing the stud 23 and the telescopic rod 22 to move.

[0050] Reference Figures 2-3 The stud 23 has an external thread 231 on its outer surface and an internal thread 214 on its inner surface that matches the external thread 231. The external thread 231 and the internal thread 214 mesh with each other, thereby achieving a threaded connection between the stud 23 and the sleeve 21. The external threads 231 of the studs 23 on the left and right sides of the center block 211 have opposite directions of rotation, and the internal threads 214 of the insert cavities 213 on the left and right sides of the center block 211 have opposite directions of rotation. Therefore, when the sleeve 21 rotates in a single direction (e.g., clockwise), it can drive the telescopic rods 22 at both ends to extend simultaneously; when the sleeve 21 rotates in another single direction (e.g., counterclockwise), it can drive the telescopic rods 22 at both ends to retract simultaneously. A sealing ring 24 is disposed between the sleeve 21 and the telescopic rod 22. The inner wall of the sealing ring 24 is pressed against the outer wall of the telescopic rod 22, and the sealing ring 24 is engaged in the annular groove on the inner wall of the sleeve 21, thereby limiting the position of the sealing ring 24. The sealing ring 24 is used to prevent impurities (such as dust particles) adhering to the outer surface of the telescopic rod 22 from entering the insertion cavity 213, thereby preventing the stud 23 and the sleeve 21 from being jammed by impurities.

[0051] Reference Figure 4 The sleeve 21 includes a first snap-fit ​​housing 2101 and a second snap-fit ​​housing 2102. The first snap-fit ​​housing 2101 and the second snap-fit ​​housing 2102 can be assembled into a cylindrical shape and fixedly connected (e.g., by bolts or by welding) to clamp the telescopic rod 22, stud 23 and sealing ring 24 from both sides.

[0052] Reference Figure 1 , Figure 6 and Figure 7The protective cover 3 includes an n-shaped plate 31 and a snap-fit ​​vertical plate 32. The n-shaped plate 31 can be fitted and snapped onto the outer periphery of the sleeve 21, thereby shielding the sleeve 21 and the telescopic rod 22 and preventing splashed concrete mortar from dripping onto the telescopic rod 22. The snap-fit ​​vertical plate 32 can be fitted and snapped onto the outer surface of the telescopic rod 22, thereby stably securing the protective cover 3 onto the cross brace assembly 2 and preventing the protective cover 3 from falling off the cross brace assembly 2 and failing to provide shielding.

[0053] Reference Figures 7-8 The n-shaped plate 31 includes an arc plate portion 311, a first upright plate portion 312, and a second upright plate portion 313. The bottom ends of the arc plate portion 311 are fixedly connected to the top ends of the first upright plate portion 312 and the second upright plate portion 313, respectively (e.g., through an integral fixed connection). The snap-fit ​​upright plate 32 is fixedly installed in the inner cavity of the protective cover 3 near the end of the arc plate portion 311. The outer edge of the snap-fit ​​upright plate 32 is integrally fixedly connected to the inner sidewall of the n-shaped plate 31.

[0054] Reference Figures 6-8 The snap-fit ​​plate 32 is n-shaped and has a slot 321 in the middle. The opening direction of the slot 321 is the same as the opening direction of the inner cavity of the n-shaped plate 31. Then the user can snap the protective cover 3 onto the outer periphery of the cross brace 2 from top to bottom, so that the middle of the protective cover 3 is located on the outer periphery of the sleeve 21 and the two ends are located on the outer periphery of the left and right telescopic rods 22 respectively. Then the splashed concrete mortar droplets will adhere to the surface of the protective cover 3 instead of the surface of the cross brace 2.

[0055] Reference Figure 8 The slot 321 can be fitted (e.g., elastically fitted) to the outer wall of the telescopic rod 22, thereby preventing the protective cover 3 from falling off the cross brace assembly 2. Since the sleeve 21 and the telescopic rod 22 are coaxially arranged, the slot 321 needs to be coaxially arranged with the arc plate part 311 to avoid structural interference and achieve adaptive installation.

[0056] Reference Figure 9 and Figure 10 The protective cover 3 also includes a first rotating base plate 33 and a second rotating base plate 34; the protective cover 3 also includes a counterweight bar 36 and a magnetic strip 35 for driving the protective cover 3 to maintain a vertical position. The counterweight bar 36 and the magnetic strip 35 are both installed at the lower part of the protective cover 3. Under the action of the gravity borne by the counterweight bar 36 and the magnetic strip 35, the protective cover 3 can always maintain a vertical position (that is, the arc plate part 311 is located directly above the cross brace assembly 2, and the first vertical plate part 312 and the second vertical plate part 313 are respectively located on the left and right sides of the cross brace assembly 2; vertically downward dripping concrete mortar droplets are blocked by the arc plate part 311, and diagonally downward splashing concrete mortar droplets are blocked by the first vertical plate part 312 / second vertical plate part 313, thereby preventing concrete mortar droplets from contacting the cross brace assembly 2).

[0057] Reference Figure 9 and Figure 10 The first rotating base plate 33 is rotatably connected at one end to the bottom end of the first upright plate 312 (e.g., via a pivot), and the other end is fixedly connected to the magnetic strip 35 (e.g., via bolts). The second rotating base plate 34 is rotatably connected at one end to the bottom end of the second upright plate 313 (e.g., via a pivot), and the other end is fixedly connected to the counterweight strip 36 (e.g., via bolts). The magnetic strip 35 and the counterweight strip 36 can attract each other to a close fit to seal the bottom of the inner cavity of the protective cover 3. The first rotating base plate 33 and the second rotating base plate 34 can rotate independently (under manual drive), so that the magnetic strip 35 and the counterweight strip 36 can approach each other, attract and fit together. At this time, the first rotating base plate 33 and the second rotating base plate 34 are both located at the bottom opening of the n-shaped plate 31, thereby achieving the sealing of the bottom of the inner cavity of the protective cover 3. After the bottom of the inner cavity of the protective cover 3 is sealed, impurities that can flow from bottom to top (such as dust, paint mist, etc.) are blocked by the first rotating base plate 33 and the second rotating base plate 34 and thus avoid contact with the cross brace assembly 2, thereby avoiding the problem of impurities adhering to the telescopic rod 22.

[0058] The arc plate portion 311 is tangent to the first vertical plate portion 312; the arc plate portion 311 is tangent to the second vertical plate portion 313; the first vertical plate portion 312 and the second vertical plate portion 313 are arranged in parallel; thus, it has excellent manufacturability.

[0059] Reference Figure 11 The width of the magnetic strip 35 is greater than the thickness of the first rotating base plate 33, and the width of the counterweight strip 36 is greater than the thickness of the second rotating base plate 34, so that the magnetic strip 35 and the counterweight strip 36 have a larger contact area and a greater adsorption force, thus avoiding the problem of the magnetic strip 35 and the counterweight strip 36 detaching from each other when the protective cover 3 is subjected to vibration (vibration is unavoidable at the construction site, such as by hoisting components, pile driving, etc.).

[0060] Reference Figure 11 The first rotating base plate 33 is fixedly connected to the magnetic strip 35 in an L-shape; the second rotating base plate 34 is fixedly connected to the counterweight strip 36 in an L-shape. When the magnetic strip 35 and the counterweight strip 36 are in contact with each other, the magnetic strip 35, the counterweight strip 36, the first rotating base plate 33 and the second rotating base plate 34 are arranged in a T-shape, so that the first rotating base plate 33 and the second rotating base plate 34 can rotate downwards (using manual force) to easily separate the magnetic strip 35 and the counterweight strip 36 (if the magnetic strip 35, the counterweight strip 36, the first rotating base plate 33 and the second rotating base plate 34 are arranged in a ⊥-shape, when the first rotating base plate 33 and the second rotating base plate 34 rotate downwards, the top of the magnetic strip 35 and the top of the counterweight strip 36 will squeeze each other, making it difficult for the first rotating base plate 33 and the second rotating base plate 34 to rotate).

[0061] Reference Figure 11The snap-fitting upright plate 32 can rotate around the telescopic rod 22; the inner surface of the n-shaped plate 31 and the outer surface of the sleeve 21 have a first movable gap; the inner edge of the snap-fitting upright plate 32 and the outer surface of the telescopic rod 22 have a second movable gap. Both the first and second movable gaps are used to allow the snap-fitting upright plate 32 to rotate smoothly, that is, to allow the protective cover 3 to rotate smoothly. If the user does not install it correctly, i.e., the protective cover 3 is installed at an angle around the outer periphery of the cross brace assembly 2, the protective cover 3 can be rotated and corrected under the drive of the counterweight and magnetic block until it remains vertical, thus giving this invention a higher installation error tolerance and improving installation convenience.

[0062] Reference Figure 5 and Figure 6 There are two snap-fitting upright plates 32. The distance L1 between the two snap-fitting upright plates 32 is adapted to the length L2 of the sleeve 21, and L1 > L2, so that the two snap-fitting upright plates 32 can be snapped at the two ends of the sleeve 21 respectively.

[0063] Reference Figure 5 and Figure 6 If the length L3 of the n-shaped plate 31 is greater than the length L2 of the sleeve 21, then the two ends of the n-shaped plate 31 extend outward to cover the two telescopic rods 22.

[0064] Reference Figure 1 , Figure 12 and Figure 13 The baffle assembly 1 includes a side plate 11 and a back support plate 12 mounted on the side wall of the side plate 11. Several back support plates 12 are provided, all vertically arranged, and are vertically fixedly connected to the side plate 11 (e.g., by welding or by bolts). An installation gap 120 is provided between adjacent back support plates 12, and the installation gap 120 is vertically arranged. A pressure block 221 is fixedly connected to the end of the telescopic rod 22 away from the sleeve 21 (e.g., by bolts or by an integral connection). The pressure block 221 is inserted into the installation gap 120 and fixedly connected to the side plate 11 by a locking bolt 122. Under the limitation of the locking bolt 122, the telescopic rod 22 cannot rotate around its own axis.

[0065] The side plate 11 has mounting holes 121, and there are several mounting holes 121 arranged vertically in a straight array. The pressure block 221 can be selectively installed in different mounting holes 121 positions by locking bolts 122, thereby installing the cross brace assembly 2 at different heights, so that a space of different heights is formed under the cross brace assembly 2, which can be used for building materials or construction equipment of different heights to move at the bottom of the trench 4, thereby improving the convenience of construction.

[0066] Installation steps: ① (Using hoisting equipment, such as a crane) Hoist the baffle assembly 1 and the cross brace assembly 2 and place them in the trench 4; ② (Manually by the user) Insert the center insert rod 25 into the center insert hole 212, and then drive the sleeve 21 to rotate, so that the cross brace assembly 2 extends until the baffle assembly 1 abuts against the inner wall of the trench 4; then pull the center insert rod 25 out of the center insert hole 212; ③ (Manually by the user) Rotate the first rotating base plate 33 and the second rotating base plate 34 so that the first rotating base plate 33 and the second rotating base plate 34 are open; ④ Fasten the protective cover 3 from top to bottom onto the outer periphery of the cross brace assembly 2, and fasten the upright plate 32 at the position of the telescopic shaft outer surface; ⑤ (Manually by the user) Rotate the first rotating base plate 33 and the second rotating base plate 34 until the magnetic strip 35 and the counterweight strip 36 attract each other and stick together, so that the first rotating base plate 33 and the second rotating base plate 34 seal the bottom opening of the inner cavity of the protective cover 3.

[0067] Dismantling steps: ① (Manually by the user) Remove the protective cover 3 from bottom to top. During the process, the bottom surface of the sleeve 21 will strike the magnetic strip 35 and the counterweight strip 36 until they separate from each other (then the first rotating base plate 33 and the second rotating base plate 34 will be open); ② (Manually by the user) Insert the center insert rod 25 into the center insert hole 212, and then drive the sleeve 21 to rotate, so that the cross brace assembly 2 shortens until the baffle assembly 1 separates from the inner wall of the groove 4; then pull the center insert rod 25 out of the center insert hole 212; ③ (Using lifting equipment, such as a crane) Lift the baffle assembly 1 and the cross brace assembly 2 out of the groove 4.

[0068] The counterweight 36 is made of ferrous metal (e.g., 45# steel), and the magnetic strip 35 is made of permanent magnet material (e.g., AlNiCo permanent magnet alloy, IronChromiumCo permanent magnet alloy, permanent magnet ferrite, etc.). The n-shaped plate 31, the snap-fit ​​upright plate 32, the first rotating base plate 33 and the second rotating base plate 34 are all made of plastic material (e.g., polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.). The density of plastic is less than the density of counterweight 36 and magnetic strip 35, so the center of gravity of the protective cover 3 is located at the bottom rather than the top, thus enabling the protective cover 3 to remain vertical for a long time.

[0069] This utility model has a simple structure and reliable function. By fastening a protective cover 3 to the outer periphery of the cross brace component 2, sticky impurities will adhere to the protective cover 3 instead of the telescopic rod 22. Thus, the telescopic rod 22 can achieve smooth extension and retraction and will not get stuck with the sleeve 21.

[0070] In traditional technologies, some designs use a telescopic sleeve around the telescopic rod 22. This sleeve is a thin, corrugated plastic cylindrical structure. Concrete mortar droplets or paint mist adhere to the sleeve rather than the rod 22, thus improving the surface cleanliness of the rod 22 and preventing it from jamming with the sleeve 21. However, in these designs, the sleeve can break off flaky pieces formed by dried sticky impurities when it contracts. These flaky pieces create sharp fracture surfaces, which can scratch the sleeve during contraction, reducing its lifespan. Furthermore, replacing the sleeve requires disassembling the connection between the baffle assembly 1 and the cross brace assembly 2, involving numerous steps. This invention uses a protective cover 3 with a thickness of over 3 mm, resulting in a longer service life, preventing fracture surfaces, and allowing for easy installation and removal from the telescopic rod 22 for convenient replacement.

[0071] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0072] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0073] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this utility model based on its guidance, without departing from its principles and spirit, shall still fall within the protection scope of this utility model.

Claims

1. A trench shoring device for municipal pipes, characterised in that: It includes a baffle assembly (1) that abuts against the inner sidewall of the groove (4), a cross brace assembly (2) for laterally supporting the baffle assembly (1), and a protective cover (3) that can be fastened to the outer periphery of the cross brace assembly (2). The cross bracing assembly (2) includes a sleeve (21) and a telescopic rod (22). The end of the telescopic rod (22) is inserted into the insertion cavity (213) of the sleeve (21), and the telescopic rod (22) can extend and retract laterally. The protective cover (3) includes an n-shaped plate (31) and a snap-fit ​​plate (32); the n-shaped plate (31) can be adapted to snap onto the outer periphery of the sleeve (21), and the snap-fit ​​plate (32) can be adapted to snap onto the outer surface of the telescopic rod (22); The n-shaped plate (31) includes an arc plate portion (311), a first upright plate portion (312), and a second upright plate portion (313). The bottom two ends of the arc plate portion (311) are fixedly connected to the top ends of the first upright plate portion (312) and the top ends of the second upright plate portion (313), respectively. The snap-fit ​​upright plate (32) is fixedly installed in the inner cavity of the protective cover (3) at the end near the arc plate portion (311). The protective cover (3) further includes a first rotating base plate (33) and a second rotating base plate (34); the protective cover (3) further includes a counterweight (36) and a magnetic strip (35) for driving the protective cover (3) to remain vertical; one end of the first rotating base plate (33) is rotatably connected to the bottom end of the first upright plate (312), and the other end is fixedly connected to the magnetic strip (35); one end of the second rotating base plate (34) is rotatably connected to the bottom end of the second upright plate (313), and the other end is fixedly connected to the counterweight (36); The magnetic strip (35) and the counterweight strip (36) can be attracted to each other to fit together and seal the bottom of the inner cavity of the protective cover (3).

2. A trench shoring arrangement for municipal pipes as claimed in claim 1, characterised in that: The snap-fit ​​plate (32) is n-shaped and has a slot (321) in the middle. The slot (321) can be adapted to snap onto the outer wall of the telescopic rod (22). The slot (321) is coaxially arranged with the arc plate (311).

3. A trench shoring arrangement for a municipal pipe according to claim 2, characterised in that: The arc plate portion (311) is tangentially disposed to the first upright plate portion (312); the arc plate portion (311) is tangentially disposed to the second upright plate portion (313); the first upright plate portion (312) and the second upright plate portion (313) are parallel to each other.

4. A trench shoring arrangement for municipal pipework according to claim 3, characterised in that: The opening direction of the inner cavity of the n-shaped plate (31) is set in the same direction as the opening direction of the slot (321).

5. A trench shoring arrangement for municipal pipework according to claim 4, characterised in that: The first rotating base plate (33) is fixedly connected to the magnetic strip (35) in an L-shape; the second rotating base plate (34) is fixedly connected to the counterweight strip (36) in an L-shape.

6. A trench shoring arrangement for municipal pipework according to claim 5, characterised in that: The snap-fit ​​plate (32) can rotate around the telescopic rod (22); the inner surface of the n-shaped plate (31) and the outer surface of the sleeve (21) are provided with a first movable gap; the inner edge of the snap-fit ​​plate (32) and the outer surface of the telescopic rod (22) are provided with a second movable gap.

7. A trench shoring arrangement for municipal pipes as claimed in claim 6, characterised in that: There are two snap-fit ​​uprights (32), and the distance between the two snap-fit ​​uprights (32) is adapted to the length of the sleeve (21).

8. A trench shoring arrangement for municipal pipes as claimed in claim 7, characterised in that: The length of the n-shaped plate (31) is greater than the length of the sleeve (21).

9. A trench shoring arrangement for a municipal pipe according to claim 8, characterised in that: The baffle assembly (1) includes a side plate (11) and a back support plate (12) installed on the side wall of the side plate (11). There are several back support plates (12) and they are all vertically arranged. There is an installation gap (120) between adjacent back support plates (12). The end of the telescopic rod (22) away from the sleeve (21) is fixedly connected to a pressure block (221), which is inserted into the installation gap (120) and fixedly connected to the side plate (11) by locking bolts (122).

10. A trench shoring arrangement for a municipal pipe according to claim 9, characterised in that: The side plate (11) has mounting holes (121), and there are several mounting holes (121) arranged vertically in a straight array. The pressure block (221) can be selectively installed in different mounting holes (121) positions by means of the locking bolt (122).

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